rev 9803 : 8146401: Clean up oop.hpp: add inline directives and fix header files
1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoaderData.hpp" 27 #include "classfile/javaClasses.inline.hpp" 28 #include "classfile/metadataOnStackMark.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "interpreter/linkResolver.hpp" 33 #include "memory/heapInspection.hpp" 34 #include "memory/metadataFactory.hpp" 35 #include "memory/oopFactory.hpp" 36 #include "oops/constantPool.hpp" 37 #include "oops/instanceKlass.hpp" 38 #include "oops/objArrayKlass.hpp" 39 #include "oops/objArrayOop.inline.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "runtime/fieldType.hpp" 42 #include "runtime/init.hpp" 43 #include "runtime/javaCalls.hpp" 44 #include "runtime/signature.hpp" 45 #include "runtime/vframe.hpp" 46 #include "utilities/copy.hpp" 47 48 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { 49 // Tags are RW but comment below applies to tags also. 50 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); 51 52 int size = ConstantPool::size(length); 53 54 // CDS considerations: 55 // Allocate read-write but may be able to move to read-only at dumping time 56 // if all the klasses are resolved. The only other field that is writable is 57 // the resolved_references array, which is recreated at startup time. 58 // But that could be moved to InstanceKlass (although a pain to access from 59 // assembly code). Maybe it could be moved to the cpCache which is RW. 60 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); 61 } 62 63 #ifdef ASSERT 64 65 // MetaspaceObj allocation invariant is calloc equivalent memory 66 // simple verification of this here (JVM_CONSTANT_Invalid == 0 ) 67 static bool tag_array_is_zero_initialized(Array<u1>* tags) { 68 assert(tags != NULL, "invariant"); 69 const int length = tags->length(); 70 for (int index = 0; index < length; ++index) { 71 if (JVM_CONSTANT_Invalid != tags->at(index)) { 72 return false; 73 } 74 } 75 return true; 76 } 77 78 #endif 79 80 ConstantPool::ConstantPool(Array<u1>* tags) : 81 _tags(tags), 82 _length(tags->length()) { 83 84 assert(_tags != NULL, "invariant"); 85 assert(tags->length() == _length, "invariant"); 86 assert(tag_array_is_zero_initialized(tags), "invariant"); 87 assert(0 == _flags, "invariant"); 88 assert(0 == version(), "invariant"); 89 assert(NULL == _pool_holder, "invariant"); 90 } 91 92 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { 93 MetadataFactory::free_metadata(loader_data, cache()); 94 set_cache(NULL); 95 MetadataFactory::free_array<u2>(loader_data, reference_map()); 96 set_reference_map(NULL); 97 98 MetadataFactory::free_array<jushort>(loader_data, operands()); 99 set_operands(NULL); 100 101 release_C_heap_structures(); 102 103 // free tag array 104 MetadataFactory::free_array<u1>(loader_data, tags()); 105 set_tags(NULL); 106 } 107 108 void ConstantPool::release_C_heap_structures() { 109 // walk constant pool and decrement symbol reference counts 110 unreference_symbols(); 111 } 112 113 objArrayOop ConstantPool::resolved_references() const { 114 return (objArrayOop)JNIHandles::resolve(_resolved_references); 115 } 116 117 // Create resolved_references array and mapping array for original cp indexes 118 // The ldc bytecode was rewritten to have the resolved reference array index so need a way 119 // to map it back for resolving and some unlikely miscellaneous uses. 120 // The objects created by invokedynamic are appended to this list. 121 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, 122 const intStack& reference_map, 123 int constant_pool_map_length, 124 TRAPS) { 125 // Initialized the resolved object cache. 126 int map_length = reference_map.length(); 127 if (map_length > 0) { 128 // Only need mapping back to constant pool entries. The map isn't used for 129 // invokedynamic resolved_reference entries. For invokedynamic entries, 130 // the constant pool cache index has the mapping back to both the constant 131 // pool and to the resolved reference index. 132 if (constant_pool_map_length > 0) { 133 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); 134 135 for (int i = 0; i < constant_pool_map_length; i++) { 136 int x = reference_map.at(i); 137 assert(x == (int)(jushort) x, "klass index is too big"); 138 om->at_put(i, (jushort)x); 139 } 140 set_reference_map(om); 141 } 142 143 // Create Java array for holding resolved strings, methodHandles, 144 // methodTypes, invokedynamic and invokehandle appendix objects, etc. 145 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 146 Handle refs_handle (THREAD, (oop)stom); // must handleize. 147 set_resolved_references(loader_data->add_handle(refs_handle)); 148 } 149 } 150 151 // CDS support. Create a new resolved_references array. 152 void ConstantPool::restore_unshareable_info(TRAPS) { 153 154 // Only create the new resolved references array if it hasn't been attempted before 155 if (resolved_references() != NULL) return; 156 157 // restore the C++ vtable from the shared archive 158 restore_vtable(); 159 160 if (SystemDictionary::Object_klass_loaded()) { 161 // Recreate the object array and add to ClassLoaderData. 162 int map_length = resolved_reference_length(); 163 if (map_length > 0) { 164 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 165 Handle refs_handle (THREAD, (oop)stom); // must handleize. 166 167 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 168 set_resolved_references(loader_data->add_handle(refs_handle)); 169 } 170 } 171 } 172 173 void ConstantPool::remove_unshareable_info() { 174 // Resolved references are not in the shared archive. 175 // Save the length for restoration. It is not necessarily the same length 176 // as reference_map.length() if invokedynamic is saved. 177 set_resolved_reference_length( 178 resolved_references() != NULL ? resolved_references()->length() : 0); 179 set_resolved_references(NULL); 180 } 181 182 int ConstantPool::cp_to_object_index(int cp_index) { 183 // this is harder don't do this so much. 184 int i = reference_map()->find(cp_index); 185 // We might not find the index for jsr292 call. 186 return (i < 0) ? _no_index_sentinel : i; 187 } 188 189 void ConstantPool::string_at_put(int which, int obj_index, oop str) { 190 resolved_references()->obj_at_put(obj_index, str); 191 } 192 193 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, KlassHandle k) { 194 ResourceMark rm; 195 int line_number = -1; 196 const char * source_file = NULL; 197 if (JavaThread::current()->has_last_Java_frame()) { 198 // try to identify the method which called this function. 199 vframeStream vfst(JavaThread::current()); 200 if (!vfst.at_end()) { 201 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 202 Symbol* s = vfst.method()->method_holder()->source_file_name(); 203 if (s != NULL) { 204 source_file = s->as_C_string(); 205 } 206 } 207 } 208 if (k() != this_cp->pool_holder()) { 209 // only print something if the classes are different 210 if (source_file != NULL) { 211 log_info(classresolve)("%s %s %s:%d", 212 this_cp->pool_holder()->external_name(), 213 k->external_name(), source_file, line_number); 214 } else { 215 log_info(classresolve)("%s %s", 216 this_cp->pool_holder()->external_name(), 217 k->external_name()); 218 } 219 } 220 } 221 222 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which, 223 bool save_resolution_error, TRAPS) { 224 assert(THREAD->is_Java_thread(), "must be a Java thread"); 225 226 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 227 // It is not safe to rely on the tag bit's here, since we don't have a lock, and 228 // the entry and tag is not updated atomicly. 229 CPSlot entry = this_cp->slot_at(which); 230 if (entry.is_resolved()) { 231 assert(entry.get_klass()->is_klass(), "must be"); 232 // Already resolved - return entry. 233 return entry.get_klass(); 234 } 235 236 // This tag doesn't change back to unresolved class unless at a safepoint. 237 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) { 238 // The original attempt to resolve this constant pool entry failed so find the 239 // class of the original error and throw another error of the same class 240 // (JVMS 5.4.3). 241 // If there is a detail message, pass that detail message to the error. 242 // The JVMS does not strictly require us to duplicate the same detail message, 243 // or any internal exception fields such as cause or stacktrace. But since the 244 // detail message is often a class name or other literal string, we will repeat it 245 // if we can find it in the symbol table. 246 throw_resolution_error(this_cp, which, CHECK_0); 247 ShouldNotReachHere(); 248 } 249 250 Handle mirror_handle; 251 Symbol* name = entry.get_symbol(); 252 Handle loader (THREAD, this_cp->pool_holder()->class_loader()); 253 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain()); 254 Klass* kk = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD); 255 KlassHandle k (THREAD, kk); 256 if (!HAS_PENDING_EXCEPTION) { 257 // preserve the resolved klass from unloading 258 mirror_handle = Handle(THREAD, kk->java_mirror()); 259 // Do access check for klasses 260 verify_constant_pool_resolve(this_cp, k, THREAD); 261 } 262 263 // Failed to resolve class. We must record the errors so that subsequent attempts 264 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). 265 if (HAS_PENDING_EXCEPTION) { 266 if (save_resolution_error) { 267 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL); 268 // If CHECK_NULL above doesn't return the exception, that means that 269 // some other thread has beaten us and has resolved the class. 270 // To preserve old behavior, we return the resolved class. 271 entry = this_cp->resolved_klass_at(which); 272 assert(entry.is_resolved(), "must be resolved if exception was cleared"); 273 assert(entry.get_klass()->is_klass(), "must be resolved to a klass"); 274 return entry.get_klass(); 275 } else { 276 return NULL; // return the pending exception 277 } 278 } 279 280 // Make this class loader depend upon the class loader owning the class reference 281 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data(); 282 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM 283 284 if (log_is_enabled(Info, classresolve) && !k->is_array_klass()) { 285 // skip resolving the constant pool so that this code gets 286 // called the next time some bytecodes refer to this class. 287 trace_class_resolution(this_cp, k); 288 return k(); 289 } else { 290 this_cp->klass_at_put(which, k()); 291 } 292 293 entry = this_cp->resolved_klass_at(which); 294 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); 295 return entry.get_klass(); 296 } 297 298 299 // Does not update ConstantPool* - to avoid any exception throwing. Used 300 // by compiler and exception handling. Also used to avoid classloads for 301 // instanceof operations. Returns NULL if the class has not been loaded or 302 // if the verification of constant pool failed 303 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) { 304 CPSlot entry = this_cp->slot_at(which); 305 if (entry.is_resolved()) { 306 assert(entry.get_klass()->is_klass(), "must be"); 307 return entry.get_klass(); 308 } else { 309 assert(entry.is_unresolved(), "must be either symbol or klass"); 310 Thread *thread = Thread::current(); 311 Symbol* name = entry.get_symbol(); 312 oop loader = this_cp->pool_holder()->class_loader(); 313 oop protection_domain = this_cp->pool_holder()->protection_domain(); 314 Handle h_prot (thread, protection_domain); 315 Handle h_loader (thread, loader); 316 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); 317 318 if (k != NULL) { 319 // Make sure that resolving is legal 320 EXCEPTION_MARK; 321 KlassHandle klass(THREAD, k); 322 // return NULL if verification fails 323 verify_constant_pool_resolve(this_cp, klass, THREAD); 324 if (HAS_PENDING_EXCEPTION) { 325 CLEAR_PENDING_EXCEPTION; 326 return NULL; 327 } 328 return klass(); 329 } else { 330 return k; 331 } 332 } 333 } 334 335 336 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) { 337 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which)); 338 } 339 340 341 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool, 342 int which) { 343 if (cpool->cache() == NULL) return NULL; // nothing to load yet 344 int cache_index = decode_cpcache_index(which, true); 345 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { 346 // FIXME: should be an assert 347 if (PrintMiscellaneous && (Verbose||WizardMode)) { 348 tty->print_cr("bad operand %d in:", which); cpool->print(); 349 } 350 return NULL; 351 } 352 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 353 return e->method_if_resolved(cpool); 354 } 355 356 357 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 358 if (cpool->cache() == NULL) return false; // nothing to load yet 359 int cache_index = decode_cpcache_index(which, true); 360 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 361 return e->has_appendix(); 362 } 363 364 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 365 if (cpool->cache() == NULL) return NULL; // nothing to load yet 366 int cache_index = decode_cpcache_index(which, true); 367 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 368 return e->appendix_if_resolved(cpool); 369 } 370 371 372 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { 373 if (cpool->cache() == NULL) return false; // nothing to load yet 374 int cache_index = decode_cpcache_index(which, true); 375 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 376 return e->has_method_type(); 377 } 378 379 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { 380 if (cpool->cache() == NULL) return NULL; // nothing to load yet 381 int cache_index = decode_cpcache_index(which, true); 382 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 383 return e->method_type_if_resolved(cpool); 384 } 385 386 387 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { 388 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 389 return symbol_at(name_index); 390 } 391 392 393 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { 394 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 395 return symbol_at(signature_index); 396 } 397 398 399 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { 400 int i = which; 401 if (!uncached && cache() != NULL) { 402 if (ConstantPool::is_invokedynamic_index(which)) { 403 // Invokedynamic index is index into resolved_references 404 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 405 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); 406 assert(tag_at(pool_index).is_name_and_type(), ""); 407 return pool_index; 408 } 409 // change byte-ordering and go via cache 410 i = remap_instruction_operand_from_cache(which); 411 } else { 412 if (tag_at(which).is_invoke_dynamic()) { 413 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); 414 assert(tag_at(pool_index).is_name_and_type(), ""); 415 return pool_index; 416 } 417 } 418 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 419 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); 420 jint ref_index = *int_at_addr(i); 421 return extract_high_short_from_int(ref_index); 422 } 423 424 425 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { 426 guarantee(!ConstantPool::is_invokedynamic_index(which), 427 "an invokedynamic instruction does not have a klass"); 428 int i = which; 429 if (!uncached && cache() != NULL) { 430 // change byte-ordering and go via cache 431 i = remap_instruction_operand_from_cache(which); 432 } 433 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 434 jint ref_index = *int_at_addr(i); 435 return extract_low_short_from_int(ref_index); 436 } 437 438 439 440 int ConstantPool::remap_instruction_operand_from_cache(int operand) { 441 int cpc_index = operand; 442 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); 443 assert((int)(u2)cpc_index == cpc_index, "clean u2"); 444 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); 445 return member_index; 446 } 447 448 449 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, KlassHandle k, TRAPS) { 450 if (k->is_instance_klass() || k->is_objArray_klass()) { 451 instanceKlassHandle holder (THREAD, this_cp->pool_holder()); 452 Klass* elem = k->is_instance_klass() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); 453 KlassHandle element (THREAD, elem); 454 455 // The element type could be a typeArray - we only need the access check if it is 456 // an reference to another class 457 if (element->is_instance_klass()) { 458 LinkResolver::check_klass_accessability(holder, element, CHECK); 459 } 460 } 461 } 462 463 464 int ConstantPool::name_ref_index_at(int which_nt) { 465 jint ref_index = name_and_type_at(which_nt); 466 return extract_low_short_from_int(ref_index); 467 } 468 469 470 int ConstantPool::signature_ref_index_at(int which_nt) { 471 jint ref_index = name_and_type_at(which_nt); 472 return extract_high_short_from_int(ref_index); 473 } 474 475 476 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { 477 return klass_at(klass_ref_index_at(which), THREAD); 478 } 479 480 481 Symbol* ConstantPool::klass_name_at(int which) const { 482 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), 483 "Corrupted constant pool"); 484 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 485 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and 486 // tag is not updated atomicly. 487 CPSlot entry = slot_at(which); 488 if (entry.is_resolved()) { 489 // Already resolved - return entry's name. 490 assert(entry.get_klass()->is_klass(), "must be"); 491 return entry.get_klass()->name(); 492 } else { 493 assert(entry.is_unresolved(), "must be either symbol or klass"); 494 return entry.get_symbol(); 495 } 496 } 497 498 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { 499 jint ref_index = klass_ref_index_at(which); 500 return klass_at_noresolve(ref_index); 501 } 502 503 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { 504 jint ref_index = uncached_klass_ref_index_at(which); 505 return klass_at_noresolve(ref_index); 506 } 507 508 char* ConstantPool::string_at_noresolve(int which) { 509 return unresolved_string_at(which)->as_C_string(); 510 } 511 512 BasicType ConstantPool::basic_type_for_signature_at(int which) const { 513 return FieldType::basic_type(symbol_at(which)); 514 } 515 516 517 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) { 518 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused 519 if (this_cp->tag_at(index).is_string()) { 520 this_cp->string_at(index, CHECK); 521 } 522 } 523 } 524 525 // Resolve all the classes in the constant pool. If they are all resolved, 526 // the constant pool is read-only. Enhancement: allocate cp entries to 527 // another metaspace, and copy to read-only or read-write space if this 528 // bit is set. 529 bool ConstantPool::resolve_class_constants(TRAPS) { 530 constantPoolHandle cp(THREAD, this); 531 for (int index = 1; index < length(); index++) { // Index 0 is unused 532 if (tag_at(index).is_unresolved_klass() && 533 klass_at_if_loaded(cp, index) == NULL) { 534 return false; 535 } 536 } 537 // set_preresolution(); or some bit for future use 538 return true; 539 } 540 541 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) { 542 // Dig out the detailed message to reuse if possible 543 Symbol* message = java_lang_Throwable::detail_message(pending_exception); 544 if (message != NULL) { 545 return message; 546 } 547 548 // Return specific message for the tag 549 switch (tag.value()) { 550 case JVM_CONSTANT_UnresolvedClass: 551 // return the class name in the error message 552 message = this_cp->klass_name_at(which); 553 break; 554 case JVM_CONSTANT_MethodHandle: 555 // return the method handle name in the error message 556 message = this_cp->method_handle_name_ref_at(which); 557 break; 558 case JVM_CONSTANT_MethodType: 559 // return the method type signature in the error message 560 message = this_cp->method_type_signature_at(which); 561 break; 562 default: 563 ShouldNotReachHere(); 564 } 565 566 return message; 567 } 568 569 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) { 570 Symbol* message = NULL; 571 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message); 572 assert(error != NULL && message != NULL, "checking"); 573 CLEAR_PENDING_EXCEPTION; 574 ResourceMark rm; 575 THROW_MSG(error, message->as_C_string()); 576 } 577 578 // If resolution for Class, MethodHandle or MethodType fails, save the exception 579 // in the resolution error table, so that the same exception is thrown again. 580 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which, 581 constantTag tag, TRAPS) { 582 Symbol* error = PENDING_EXCEPTION->klass()->name(); 583 584 int error_tag = tag.error_value(); 585 586 if (!PENDING_EXCEPTION-> 587 is_a(SystemDictionary::LinkageError_klass())) { 588 // Just throw the exception and don't prevent these classes from 589 // being loaded due to virtual machine errors like StackOverflow 590 // and OutOfMemoryError, etc, or if the thread was hit by stop() 591 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 592 } else if (this_cp->tag_at(which).value() != error_tag) { 593 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION); 594 SystemDictionary::add_resolution_error(this_cp, which, error, message); 595 // CAS in the tag. If a thread beat us to registering this error that's fine. 596 // If another thread resolved the reference, this is a race condition. This 597 // thread may have had a security manager or something temporary. 598 // This doesn't deterministically get an error. So why do we save this? 599 // We save this because jvmti can add classes to the bootclass path after 600 // this error, so it needs to get the same error if the error is first. 601 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag, 602 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value()); 603 if (old_tag != error_tag && old_tag != tag.value()) { 604 // MethodHandles and MethodType doesn't change to resolved version. 605 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value"); 606 // Forget the exception and use the resolved class. 607 CLEAR_PENDING_EXCEPTION; 608 } 609 } else { 610 // some other thread put this in error state 611 throw_resolution_error(this_cp, which, CHECK); 612 } 613 } 614 615 // Called to resolve constants in the constant pool and return an oop. 616 // Some constant pool entries cache their resolved oop. This is also 617 // called to create oops from constants to use in arguments for invokedynamic 618 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) { 619 oop result_oop = NULL; 620 Handle throw_exception; 621 622 if (cache_index == _possible_index_sentinel) { 623 // It is possible that this constant is one which is cached in the objects. 624 // We'll do a linear search. This should be OK because this usage is rare. 625 assert(index > 0, "valid index"); 626 cache_index = this_cp->cp_to_object_index(index); 627 } 628 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); 629 assert(index == _no_index_sentinel || index >= 0, ""); 630 631 if (cache_index >= 0) { 632 result_oop = this_cp->resolved_references()->obj_at(cache_index); 633 if (result_oop != NULL) { 634 return result_oop; 635 // That was easy... 636 } 637 index = this_cp->object_to_cp_index(cache_index); 638 } 639 640 jvalue prim_value; // temp used only in a few cases below 641 642 constantTag tag = this_cp->tag_at(index); 643 644 switch (tag.value()) { 645 646 case JVM_CONSTANT_UnresolvedClass: 647 case JVM_CONSTANT_UnresolvedClassInError: 648 case JVM_CONSTANT_Class: 649 { 650 assert(cache_index == _no_index_sentinel, "should not have been set"); 651 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL); 652 // ldc wants the java mirror. 653 result_oop = resolved->java_mirror(); 654 break; 655 } 656 657 case JVM_CONSTANT_String: 658 assert(cache_index != _no_index_sentinel, "should have been set"); 659 if (this_cp->is_pseudo_string_at(index)) { 660 result_oop = this_cp->pseudo_string_at(index, cache_index); 661 break; 662 } 663 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL); 664 break; 665 666 case JVM_CONSTANT_MethodHandleInError: 667 case JVM_CONSTANT_MethodTypeInError: 668 { 669 throw_resolution_error(this_cp, index, CHECK_NULL); 670 break; 671 } 672 673 case JVM_CONSTANT_MethodHandle: 674 { 675 int ref_kind = this_cp->method_handle_ref_kind_at(index); 676 int callee_index = this_cp->method_handle_klass_index_at(index); 677 Symbol* name = this_cp->method_handle_name_ref_at(index); 678 Symbol* signature = this_cp->method_handle_signature_ref_at(index); 679 if (PrintMiscellaneous) 680 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", 681 ref_kind, index, this_cp->method_handle_index_at(index), 682 callee_index, name->as_C_string(), signature->as_C_string()); 683 KlassHandle callee; 684 { Klass* k = klass_at_impl(this_cp, callee_index, true, CHECK_NULL); 685 callee = KlassHandle(THREAD, k); 686 } 687 KlassHandle klass(THREAD, this_cp->pool_holder()); 688 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, 689 callee, name, signature, 690 THREAD); 691 result_oop = value(); 692 if (HAS_PENDING_EXCEPTION) { 693 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 694 } 695 break; 696 } 697 698 case JVM_CONSTANT_MethodType: 699 { 700 Symbol* signature = this_cp->method_type_signature_at(index); 701 if (PrintMiscellaneous) 702 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", 703 index, this_cp->method_type_index_at(index), 704 signature->as_C_string()); 705 KlassHandle klass(THREAD, this_cp->pool_holder()); 706 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); 707 result_oop = value(); 708 if (HAS_PENDING_EXCEPTION) { 709 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 710 } 711 break; 712 } 713 714 case JVM_CONSTANT_Integer: 715 assert(cache_index == _no_index_sentinel, "should not have been set"); 716 prim_value.i = this_cp->int_at(index); 717 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); 718 break; 719 720 case JVM_CONSTANT_Float: 721 assert(cache_index == _no_index_sentinel, "should not have been set"); 722 prim_value.f = this_cp->float_at(index); 723 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); 724 break; 725 726 case JVM_CONSTANT_Long: 727 assert(cache_index == _no_index_sentinel, "should not have been set"); 728 prim_value.j = this_cp->long_at(index); 729 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); 730 break; 731 732 case JVM_CONSTANT_Double: 733 assert(cache_index == _no_index_sentinel, "should not have been set"); 734 prim_value.d = this_cp->double_at(index); 735 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); 736 break; 737 738 default: 739 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", 740 this_cp(), index, cache_index, tag.value())); 741 assert(false, "unexpected constant tag"); 742 break; 743 } 744 745 if (cache_index >= 0) { 746 // Benign race condition: resolved_references may already be filled in. 747 // The important thing here is that all threads pick up the same result. 748 // It doesn't matter which racing thread wins, as long as only one 749 // result is used by all threads, and all future queries. 750 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL); 751 if (old_result == NULL) { 752 return result_oop; // was installed 753 } else { 754 // Return the winning thread's result. This can be different than 755 // the result here for MethodHandles. 756 return old_result; 757 } 758 } else { 759 return result_oop; 760 } 761 } 762 763 oop ConstantPool::uncached_string_at(int which, TRAPS) { 764 Symbol* sym = unresolved_string_at(which); 765 oop str = StringTable::intern(sym, CHECK_(NULL)); 766 assert(java_lang_String::is_instance(str), "must be string"); 767 return str; 768 } 769 770 771 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) { 772 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); 773 774 Handle bsm; 775 int argc; 776 { 777 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments 778 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. 779 // It is accompanied by the optional arguments. 780 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index); 781 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); 782 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { 783 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); 784 } 785 786 // Extract the optional static arguments. 787 argc = this_cp->invoke_dynamic_argument_count_at(index); 788 if (argc == 0) return bsm_oop; 789 790 bsm = Handle(THREAD, bsm_oop); 791 } 792 793 objArrayHandle info; 794 { 795 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); 796 info = objArrayHandle(THREAD, info_oop); 797 } 798 799 info->obj_at_put(0, bsm()); 800 for (int i = 0; i < argc; i++) { 801 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i); 802 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); 803 info->obj_at_put(1+i, arg_oop); 804 } 805 806 return info(); 807 } 808 809 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) { 810 // If the string has already been interned, this entry will be non-null 811 oop str = this_cp->resolved_references()->obj_at(obj_index); 812 if (str != NULL) return str; 813 Symbol* sym = this_cp->unresolved_string_at(which); 814 str = StringTable::intern(sym, CHECK_(NULL)); 815 this_cp->string_at_put(which, obj_index, str); 816 assert(java_lang_String::is_instance(str), "must be string"); 817 return str; 818 } 819 820 821 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, 822 int which) { 823 // Names are interned, so we can compare Symbol*s directly 824 Symbol* cp_name = klass_name_at(which); 825 return (cp_name == k->name()); 826 } 827 828 829 // Iterate over symbols and decrement ones which are Symbol*s 830 // This is done during GC. 831 // Only decrement the UTF8 symbols. Unresolved classes and strings point to 832 // these symbols but didn't increment the reference count. 833 void ConstantPool::unreference_symbols() { 834 for (int index = 1; index < length(); index++) { // Index 0 is unused 835 constantTag tag = tag_at(index); 836 if (tag.is_symbol()) { 837 symbol_at(index)->decrement_refcount(); 838 } 839 } 840 } 841 842 843 // Compare this constant pool's entry at index1 to the constant pool 844 // cp2's entry at index2. 845 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2, 846 int index2, TRAPS) { 847 848 // The error tags are equivalent to non-error tags when comparing 849 jbyte t1 = tag_at(index1).non_error_value(); 850 jbyte t2 = cp2->tag_at(index2).non_error_value(); 851 852 if (t1 != t2) { 853 // Not the same entry type so there is nothing else to check. Note 854 // that this style of checking will consider resolved/unresolved 855 // class pairs as different. 856 // From the ConstantPool* API point of view, this is correct 857 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this 858 // plays out in the context of ConstantPool* merging. 859 return false; 860 } 861 862 switch (t1) { 863 case JVM_CONSTANT_Class: 864 { 865 Klass* k1 = klass_at(index1, CHECK_false); 866 Klass* k2 = cp2->klass_at(index2, CHECK_false); 867 if (k1 == k2) { 868 return true; 869 } 870 } break; 871 872 case JVM_CONSTANT_ClassIndex: 873 { 874 int recur1 = klass_index_at(index1); 875 int recur2 = cp2->klass_index_at(index2); 876 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 877 if (match) { 878 return true; 879 } 880 } break; 881 882 case JVM_CONSTANT_Double: 883 { 884 jdouble d1 = double_at(index1); 885 jdouble d2 = cp2->double_at(index2); 886 if (d1 == d2) { 887 return true; 888 } 889 } break; 890 891 case JVM_CONSTANT_Fieldref: 892 case JVM_CONSTANT_InterfaceMethodref: 893 case JVM_CONSTANT_Methodref: 894 { 895 int recur1 = uncached_klass_ref_index_at(index1); 896 int recur2 = cp2->uncached_klass_ref_index_at(index2); 897 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 898 if (match) { 899 recur1 = uncached_name_and_type_ref_index_at(index1); 900 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); 901 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 902 if (match) { 903 return true; 904 } 905 } 906 } break; 907 908 case JVM_CONSTANT_Float: 909 { 910 jfloat f1 = float_at(index1); 911 jfloat f2 = cp2->float_at(index2); 912 if (f1 == f2) { 913 return true; 914 } 915 } break; 916 917 case JVM_CONSTANT_Integer: 918 { 919 jint i1 = int_at(index1); 920 jint i2 = cp2->int_at(index2); 921 if (i1 == i2) { 922 return true; 923 } 924 } break; 925 926 case JVM_CONSTANT_Long: 927 { 928 jlong l1 = long_at(index1); 929 jlong l2 = cp2->long_at(index2); 930 if (l1 == l2) { 931 return true; 932 } 933 } break; 934 935 case JVM_CONSTANT_NameAndType: 936 { 937 int recur1 = name_ref_index_at(index1); 938 int recur2 = cp2->name_ref_index_at(index2); 939 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 940 if (match) { 941 recur1 = signature_ref_index_at(index1); 942 recur2 = cp2->signature_ref_index_at(index2); 943 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 944 if (match) { 945 return true; 946 } 947 } 948 } break; 949 950 case JVM_CONSTANT_StringIndex: 951 { 952 int recur1 = string_index_at(index1); 953 int recur2 = cp2->string_index_at(index2); 954 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 955 if (match) { 956 return true; 957 } 958 } break; 959 960 case JVM_CONSTANT_UnresolvedClass: 961 { 962 Symbol* k1 = klass_name_at(index1); 963 Symbol* k2 = cp2->klass_name_at(index2); 964 if (k1 == k2) { 965 return true; 966 } 967 } break; 968 969 case JVM_CONSTANT_MethodType: 970 { 971 int k1 = method_type_index_at_error_ok(index1); 972 int k2 = cp2->method_type_index_at_error_ok(index2); 973 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 974 if (match) { 975 return true; 976 } 977 } break; 978 979 case JVM_CONSTANT_MethodHandle: 980 { 981 int k1 = method_handle_ref_kind_at_error_ok(index1); 982 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2); 983 if (k1 == k2) { 984 int i1 = method_handle_index_at_error_ok(index1); 985 int i2 = cp2->method_handle_index_at_error_ok(index2); 986 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); 987 if (match) { 988 return true; 989 } 990 } 991 } break; 992 993 case JVM_CONSTANT_InvokeDynamic: 994 { 995 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); 996 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); 997 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); 998 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); 999 // separate statements and variables because CHECK_false is used 1000 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); 1001 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); 1002 return (match_entry && match_operand); 1003 } break; 1004 1005 case JVM_CONSTANT_String: 1006 { 1007 Symbol* s1 = unresolved_string_at(index1); 1008 Symbol* s2 = cp2->unresolved_string_at(index2); 1009 if (s1 == s2) { 1010 return true; 1011 } 1012 } break; 1013 1014 case JVM_CONSTANT_Utf8: 1015 { 1016 Symbol* s1 = symbol_at(index1); 1017 Symbol* s2 = cp2->symbol_at(index2); 1018 if (s1 == s2) { 1019 return true; 1020 } 1021 } break; 1022 1023 // Invalid is used as the tag for the second constant pool entry 1024 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1025 // not be seen by itself. 1026 case JVM_CONSTANT_Invalid: // fall through 1027 1028 default: 1029 ShouldNotReachHere(); 1030 break; 1031 } 1032 1033 return false; 1034 } // end compare_entry_to() 1035 1036 1037 // Resize the operands array with delta_len and delta_size. 1038 // Used in RedefineClasses for CP merge. 1039 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { 1040 int old_len = operand_array_length(operands()); 1041 int new_len = old_len + delta_len; 1042 int min_len = (delta_len > 0) ? old_len : new_len; 1043 1044 int old_size = operands()->length(); 1045 int new_size = old_size + delta_size; 1046 int min_size = (delta_size > 0) ? old_size : new_size; 1047 1048 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1049 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); 1050 1051 // Set index in the resized array for existing elements only 1052 for (int idx = 0; idx < min_len; idx++) { 1053 int offset = operand_offset_at(idx); // offset in original array 1054 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array 1055 } 1056 // Copy the bootstrap specifiers only 1057 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), 1058 new_ops->adr_at(2*new_len), 1059 (min_size - 2*min_len) * sizeof(u2)); 1060 // Explicitly deallocate old operands array. 1061 // Note, it is not needed for 7u backport. 1062 if ( operands() != NULL) { // the safety check 1063 MetadataFactory::free_array<u2>(loader_data, operands()); 1064 } 1065 set_operands(new_ops); 1066 } // end resize_operands() 1067 1068 1069 // Extend the operands array with the length and size of the ext_cp operands. 1070 // Used in RedefineClasses for CP merge. 1071 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) { 1072 int delta_len = operand_array_length(ext_cp->operands()); 1073 if (delta_len == 0) { 1074 return; // nothing to do 1075 } 1076 int delta_size = ext_cp->operands()->length(); 1077 1078 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); 1079 1080 if (operand_array_length(operands()) == 0) { 1081 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1082 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); 1083 // The first element index defines the offset of second part 1084 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array 1085 set_operands(new_ops); 1086 } else { 1087 resize_operands(delta_len, delta_size, CHECK); 1088 } 1089 1090 } // end extend_operands() 1091 1092 1093 // Shrink the operands array to a smaller array with new_len length. 1094 // Used in RedefineClasses for CP merge. 1095 void ConstantPool::shrink_operands(int new_len, TRAPS) { 1096 int old_len = operand_array_length(operands()); 1097 if (new_len == old_len) { 1098 return; // nothing to do 1099 } 1100 assert(new_len < old_len, "shrunken operands array must be smaller"); 1101 1102 int free_base = operand_next_offset_at(new_len - 1); 1103 int delta_len = new_len - old_len; 1104 int delta_size = 2*delta_len + free_base - operands()->length(); 1105 1106 resize_operands(delta_len, delta_size, CHECK); 1107 1108 } // end shrink_operands() 1109 1110 1111 void ConstantPool::copy_operands(const constantPoolHandle& from_cp, 1112 const constantPoolHandle& to_cp, 1113 TRAPS) { 1114 1115 int from_oplen = operand_array_length(from_cp->operands()); 1116 int old_oplen = operand_array_length(to_cp->operands()); 1117 if (from_oplen != 0) { 1118 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); 1119 // append my operands to the target's operands array 1120 if (old_oplen == 0) { 1121 // Can't just reuse from_cp's operand list because of deallocation issues 1122 int len = from_cp->operands()->length(); 1123 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); 1124 Copy::conjoint_memory_atomic( 1125 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); 1126 to_cp->set_operands(new_ops); 1127 } else { 1128 int old_len = to_cp->operands()->length(); 1129 int from_len = from_cp->operands()->length(); 1130 int old_off = old_oplen * sizeof(u2); 1131 int from_off = from_oplen * sizeof(u2); 1132 // Use the metaspace for the destination constant pool 1133 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); 1134 int fillp = 0, len = 0; 1135 // first part of dest 1136 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1137 new_operands->adr_at(fillp), 1138 (len = old_off) * sizeof(u2)); 1139 fillp += len; 1140 // first part of src 1141 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), 1142 new_operands->adr_at(fillp), 1143 (len = from_off) * sizeof(u2)); 1144 fillp += len; 1145 // second part of dest 1146 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), 1147 new_operands->adr_at(fillp), 1148 (len = old_len - old_off) * sizeof(u2)); 1149 fillp += len; 1150 // second part of src 1151 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), 1152 new_operands->adr_at(fillp), 1153 (len = from_len - from_off) * sizeof(u2)); 1154 fillp += len; 1155 assert(fillp == new_operands->length(), ""); 1156 1157 // Adjust indexes in the first part of the copied operands array. 1158 for (int j = 0; j < from_oplen; j++) { 1159 int offset = operand_offset_at(new_operands, old_oplen + j); 1160 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); 1161 offset += old_len; // every new tuple is preceded by old_len extra u2's 1162 operand_offset_at_put(new_operands, old_oplen + j, offset); 1163 } 1164 1165 // replace target operands array with combined array 1166 to_cp->set_operands(new_operands); 1167 } 1168 } 1169 } // end copy_operands() 1170 1171 1172 // Copy this constant pool's entries at start_i to end_i (inclusive) 1173 // to the constant pool to_cp's entries starting at to_i. A total of 1174 // (end_i - start_i) + 1 entries are copied. 1175 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i, 1176 const constantPoolHandle& to_cp, int to_i, TRAPS) { 1177 1178 1179 int dest_i = to_i; // leave original alone for debug purposes 1180 1181 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { 1182 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); 1183 1184 switch (from_cp->tag_at(src_i).value()) { 1185 case JVM_CONSTANT_Double: 1186 case JVM_CONSTANT_Long: 1187 // double and long take two constant pool entries 1188 src_i += 2; 1189 dest_i += 2; 1190 break; 1191 1192 default: 1193 // all others take one constant pool entry 1194 src_i++; 1195 dest_i++; 1196 break; 1197 } 1198 } 1199 copy_operands(from_cp, to_cp, CHECK); 1200 1201 } // end copy_cp_to_impl() 1202 1203 1204 // Copy this constant pool's entry at from_i to the constant pool 1205 // to_cp's entry at to_i. 1206 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i, 1207 const constantPoolHandle& to_cp, int to_i, 1208 TRAPS) { 1209 1210 int tag = from_cp->tag_at(from_i).value(); 1211 switch (tag) { 1212 case JVM_CONSTANT_Class: 1213 { 1214 Klass* k = from_cp->klass_at(from_i, CHECK); 1215 to_cp->klass_at_put(to_i, k); 1216 } break; 1217 1218 case JVM_CONSTANT_ClassIndex: 1219 { 1220 jint ki = from_cp->klass_index_at(from_i); 1221 to_cp->klass_index_at_put(to_i, ki); 1222 } break; 1223 1224 case JVM_CONSTANT_Double: 1225 { 1226 jdouble d = from_cp->double_at(from_i); 1227 to_cp->double_at_put(to_i, d); 1228 // double takes two constant pool entries so init second entry's tag 1229 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1230 } break; 1231 1232 case JVM_CONSTANT_Fieldref: 1233 { 1234 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1235 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1236 to_cp->field_at_put(to_i, class_index, name_and_type_index); 1237 } break; 1238 1239 case JVM_CONSTANT_Float: 1240 { 1241 jfloat f = from_cp->float_at(from_i); 1242 to_cp->float_at_put(to_i, f); 1243 } break; 1244 1245 case JVM_CONSTANT_Integer: 1246 { 1247 jint i = from_cp->int_at(from_i); 1248 to_cp->int_at_put(to_i, i); 1249 } break; 1250 1251 case JVM_CONSTANT_InterfaceMethodref: 1252 { 1253 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1254 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1255 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); 1256 } break; 1257 1258 case JVM_CONSTANT_Long: 1259 { 1260 jlong l = from_cp->long_at(from_i); 1261 to_cp->long_at_put(to_i, l); 1262 // long takes two constant pool entries so init second entry's tag 1263 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1264 } break; 1265 1266 case JVM_CONSTANT_Methodref: 1267 { 1268 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1269 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1270 to_cp->method_at_put(to_i, class_index, name_and_type_index); 1271 } break; 1272 1273 case JVM_CONSTANT_NameAndType: 1274 { 1275 int name_ref_index = from_cp->name_ref_index_at(from_i); 1276 int signature_ref_index = from_cp->signature_ref_index_at(from_i); 1277 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); 1278 } break; 1279 1280 case JVM_CONSTANT_StringIndex: 1281 { 1282 jint si = from_cp->string_index_at(from_i); 1283 to_cp->string_index_at_put(to_i, si); 1284 } break; 1285 1286 case JVM_CONSTANT_UnresolvedClass: 1287 case JVM_CONSTANT_UnresolvedClassInError: 1288 { 1289 // Can be resolved after checking tag, so check the slot first. 1290 CPSlot entry = from_cp->slot_at(from_i); 1291 if (entry.is_resolved()) { 1292 assert(entry.get_klass()->is_klass(), "must be"); 1293 // Already resolved 1294 to_cp->klass_at_put(to_i, entry.get_klass()); 1295 } else { 1296 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); 1297 } 1298 } break; 1299 1300 case JVM_CONSTANT_String: 1301 { 1302 Symbol* s = from_cp->unresolved_string_at(from_i); 1303 to_cp->unresolved_string_at_put(to_i, s); 1304 } break; 1305 1306 case JVM_CONSTANT_Utf8: 1307 { 1308 Symbol* s = from_cp->symbol_at(from_i); 1309 // Need to increase refcount, the old one will be thrown away and deferenced 1310 s->increment_refcount(); 1311 to_cp->symbol_at_put(to_i, s); 1312 } break; 1313 1314 case JVM_CONSTANT_MethodType: 1315 case JVM_CONSTANT_MethodTypeInError: 1316 { 1317 jint k = from_cp->method_type_index_at_error_ok(from_i); 1318 to_cp->method_type_index_at_put(to_i, k); 1319 } break; 1320 1321 case JVM_CONSTANT_MethodHandle: 1322 case JVM_CONSTANT_MethodHandleInError: 1323 { 1324 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i); 1325 int k2 = from_cp->method_handle_index_at_error_ok(from_i); 1326 to_cp->method_handle_index_at_put(to_i, k1, k2); 1327 } break; 1328 1329 case JVM_CONSTANT_InvokeDynamic: 1330 { 1331 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); 1332 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); 1333 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1334 to_cp->invoke_dynamic_at_put(to_i, k1, k2); 1335 } break; 1336 1337 // Invalid is used as the tag for the second constant pool entry 1338 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1339 // not be seen by itself. 1340 case JVM_CONSTANT_Invalid: // fall through 1341 1342 default: 1343 { 1344 ShouldNotReachHere(); 1345 } break; 1346 } 1347 } // end copy_entry_to() 1348 1349 1350 // Search constant pool search_cp for an entry that matches this 1351 // constant pool's entry at pattern_i. Returns the index of a 1352 // matching entry or zero (0) if there is no matching entry. 1353 int ConstantPool::find_matching_entry(int pattern_i, 1354 const constantPoolHandle& search_cp, TRAPS) { 1355 1356 // index zero (0) is not used 1357 for (int i = 1; i < search_cp->length(); i++) { 1358 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); 1359 if (found) { 1360 return i; 1361 } 1362 } 1363 1364 return 0; // entry not found; return unused index zero (0) 1365 } // end find_matching_entry() 1366 1367 1368 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool 1369 // cp2's bootstrap specifier at idx2. 1370 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) { 1371 int k1 = operand_bootstrap_method_ref_index_at(idx1); 1372 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); 1373 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1374 1375 if (!match) { 1376 return false; 1377 } 1378 int argc = operand_argument_count_at(idx1); 1379 if (argc == cp2->operand_argument_count_at(idx2)) { 1380 for (int j = 0; j < argc; j++) { 1381 k1 = operand_argument_index_at(idx1, j); 1382 k2 = cp2->operand_argument_index_at(idx2, j); 1383 match = compare_entry_to(k1, cp2, k2, CHECK_false); 1384 if (!match) { 1385 return false; 1386 } 1387 } 1388 return true; // got through loop; all elements equal 1389 } 1390 return false; 1391 } // end compare_operand_to() 1392 1393 // Search constant pool search_cp for a bootstrap specifier that matches 1394 // this constant pool's bootstrap specifier at pattern_i index. 1395 // Return the index of a matching bootstrap specifier or (-1) if there is no match. 1396 int ConstantPool::find_matching_operand(int pattern_i, 1397 const constantPoolHandle& search_cp, int search_len, TRAPS) { 1398 for (int i = 0; i < search_len; i++) { 1399 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); 1400 if (found) { 1401 return i; 1402 } 1403 } 1404 return -1; // bootstrap specifier not found; return unused index (-1) 1405 } // end find_matching_operand() 1406 1407 1408 #ifndef PRODUCT 1409 1410 const char* ConstantPool::printable_name_at(int which) { 1411 1412 constantTag tag = tag_at(which); 1413 1414 if (tag.is_string()) { 1415 return string_at_noresolve(which); 1416 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 1417 return klass_name_at(which)->as_C_string(); 1418 } else if (tag.is_symbol()) { 1419 return symbol_at(which)->as_C_string(); 1420 } 1421 return ""; 1422 } 1423 1424 #endif // PRODUCT 1425 1426 1427 // JVMTI GetConstantPool support 1428 1429 // For debugging of constant pool 1430 const bool debug_cpool = false; 1431 1432 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) 1433 1434 static void print_cpool_bytes(jint cnt, u1 *bytes) { 1435 const char* WARN_MSG = "Must not be such entry!"; 1436 jint size = 0; 1437 u2 idx1, idx2; 1438 1439 for (jint idx = 1; idx < cnt; idx++) { 1440 jint ent_size = 0; 1441 u1 tag = *bytes++; 1442 size++; // count tag 1443 1444 printf("const #%03d, tag: %02d ", idx, tag); 1445 switch(tag) { 1446 case JVM_CONSTANT_Invalid: { 1447 printf("Invalid"); 1448 break; 1449 } 1450 case JVM_CONSTANT_Unicode: { 1451 printf("Unicode %s", WARN_MSG); 1452 break; 1453 } 1454 case JVM_CONSTANT_Utf8: { 1455 u2 len = Bytes::get_Java_u2(bytes); 1456 char str[128]; 1457 if (len > 127) { 1458 len = 127; 1459 } 1460 strncpy(str, (char *) (bytes+2), len); 1461 str[len] = '\0'; 1462 printf("Utf8 \"%s\"", str); 1463 ent_size = 2 + len; 1464 break; 1465 } 1466 case JVM_CONSTANT_Integer: { 1467 u4 val = Bytes::get_Java_u4(bytes); 1468 printf("int %d", *(int *) &val); 1469 ent_size = 4; 1470 break; 1471 } 1472 case JVM_CONSTANT_Float: { 1473 u4 val = Bytes::get_Java_u4(bytes); 1474 printf("float %5.3ff", *(float *) &val); 1475 ent_size = 4; 1476 break; 1477 } 1478 case JVM_CONSTANT_Long: { 1479 u8 val = Bytes::get_Java_u8(bytes); 1480 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val); 1481 ent_size = 8; 1482 idx++; // Long takes two cpool slots 1483 break; 1484 } 1485 case JVM_CONSTANT_Double: { 1486 u8 val = Bytes::get_Java_u8(bytes); 1487 printf("double %5.3fd", *(jdouble *)&val); 1488 ent_size = 8; 1489 idx++; // Double takes two cpool slots 1490 break; 1491 } 1492 case JVM_CONSTANT_Class: { 1493 idx1 = Bytes::get_Java_u2(bytes); 1494 printf("class #%03d", idx1); 1495 ent_size = 2; 1496 break; 1497 } 1498 case JVM_CONSTANT_String: { 1499 idx1 = Bytes::get_Java_u2(bytes); 1500 printf("String #%03d", idx1); 1501 ent_size = 2; 1502 break; 1503 } 1504 case JVM_CONSTANT_Fieldref: { 1505 idx1 = Bytes::get_Java_u2(bytes); 1506 idx2 = Bytes::get_Java_u2(bytes+2); 1507 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); 1508 ent_size = 4; 1509 break; 1510 } 1511 case JVM_CONSTANT_Methodref: { 1512 idx1 = Bytes::get_Java_u2(bytes); 1513 idx2 = Bytes::get_Java_u2(bytes+2); 1514 printf("Method #%03d, #%03d", idx1, idx2); 1515 ent_size = 4; 1516 break; 1517 } 1518 case JVM_CONSTANT_InterfaceMethodref: { 1519 idx1 = Bytes::get_Java_u2(bytes); 1520 idx2 = Bytes::get_Java_u2(bytes+2); 1521 printf("InterfMethod #%03d, #%03d", idx1, idx2); 1522 ent_size = 4; 1523 break; 1524 } 1525 case JVM_CONSTANT_NameAndType: { 1526 idx1 = Bytes::get_Java_u2(bytes); 1527 idx2 = Bytes::get_Java_u2(bytes+2); 1528 printf("NameAndType #%03d, #%03d", idx1, idx2); 1529 ent_size = 4; 1530 break; 1531 } 1532 case JVM_CONSTANT_ClassIndex: { 1533 printf("ClassIndex %s", WARN_MSG); 1534 break; 1535 } 1536 case JVM_CONSTANT_UnresolvedClass: { 1537 printf("UnresolvedClass: %s", WARN_MSG); 1538 break; 1539 } 1540 case JVM_CONSTANT_UnresolvedClassInError: { 1541 printf("UnresolvedClassInErr: %s", WARN_MSG); 1542 break; 1543 } 1544 case JVM_CONSTANT_StringIndex: { 1545 printf("StringIndex: %s", WARN_MSG); 1546 break; 1547 } 1548 } 1549 printf(";\n"); 1550 bytes += ent_size; 1551 size += ent_size; 1552 } 1553 printf("Cpool size: %d\n", size); 1554 fflush(0); 1555 return; 1556 } /* end print_cpool_bytes */ 1557 1558 1559 // Returns size of constant pool entry. 1560 jint ConstantPool::cpool_entry_size(jint idx) { 1561 switch(tag_at(idx).value()) { 1562 case JVM_CONSTANT_Invalid: 1563 case JVM_CONSTANT_Unicode: 1564 return 1; 1565 1566 case JVM_CONSTANT_Utf8: 1567 return 3 + symbol_at(idx)->utf8_length(); 1568 1569 case JVM_CONSTANT_Class: 1570 case JVM_CONSTANT_String: 1571 case JVM_CONSTANT_ClassIndex: 1572 case JVM_CONSTANT_UnresolvedClass: 1573 case JVM_CONSTANT_UnresolvedClassInError: 1574 case JVM_CONSTANT_StringIndex: 1575 case JVM_CONSTANT_MethodType: 1576 case JVM_CONSTANT_MethodTypeInError: 1577 return 3; 1578 1579 case JVM_CONSTANT_MethodHandle: 1580 case JVM_CONSTANT_MethodHandleInError: 1581 return 4; //tag, ref_kind, ref_index 1582 1583 case JVM_CONSTANT_Integer: 1584 case JVM_CONSTANT_Float: 1585 case JVM_CONSTANT_Fieldref: 1586 case JVM_CONSTANT_Methodref: 1587 case JVM_CONSTANT_InterfaceMethodref: 1588 case JVM_CONSTANT_NameAndType: 1589 return 5; 1590 1591 case JVM_CONSTANT_InvokeDynamic: 1592 // u1 tag, u2 bsm, u2 nt 1593 return 5; 1594 1595 case JVM_CONSTANT_Long: 1596 case JVM_CONSTANT_Double: 1597 return 9; 1598 } 1599 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); 1600 return 1; 1601 } /* end cpool_entry_size */ 1602 1603 1604 // SymbolHashMap is used to find a constant pool index from a string. 1605 // This function fills in SymbolHashMaps, one for utf8s and one for 1606 // class names, returns size of the cpool raw bytes. 1607 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, 1608 SymbolHashMap *classmap) { 1609 jint size = 0; 1610 1611 for (u2 idx = 1; idx < length(); idx++) { 1612 u2 tag = tag_at(idx).value(); 1613 size += cpool_entry_size(idx); 1614 1615 switch(tag) { 1616 case JVM_CONSTANT_Utf8: { 1617 Symbol* sym = symbol_at(idx); 1618 symmap->add_entry(sym, idx); 1619 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); 1620 break; 1621 } 1622 case JVM_CONSTANT_Class: 1623 case JVM_CONSTANT_UnresolvedClass: 1624 case JVM_CONSTANT_UnresolvedClassInError: { 1625 Symbol* sym = klass_name_at(idx); 1626 classmap->add_entry(sym, idx); 1627 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); 1628 break; 1629 } 1630 case JVM_CONSTANT_Long: 1631 case JVM_CONSTANT_Double: { 1632 idx++; // Both Long and Double take two cpool slots 1633 break; 1634 } 1635 } 1636 } 1637 return size; 1638 } /* end hash_utf8_entries_to */ 1639 1640 1641 // Copy cpool bytes. 1642 // Returns: 1643 // 0, in case of OutOfMemoryError 1644 // -1, in case of internal error 1645 // > 0, count of the raw cpool bytes that have been copied 1646 int ConstantPool::copy_cpool_bytes(int cpool_size, 1647 SymbolHashMap* tbl, 1648 unsigned char *bytes) { 1649 u2 idx1, idx2; 1650 jint size = 0; 1651 jint cnt = length(); 1652 unsigned char *start_bytes = bytes; 1653 1654 for (jint idx = 1; idx < cnt; idx++) { 1655 u1 tag = tag_at(idx).value(); 1656 jint ent_size = cpool_entry_size(idx); 1657 1658 assert(size + ent_size <= cpool_size, "Size mismatch"); 1659 1660 *bytes = tag; 1661 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); 1662 switch(tag) { 1663 case JVM_CONSTANT_Invalid: { 1664 DBG(printf("JVM_CONSTANT_Invalid")); 1665 break; 1666 } 1667 case JVM_CONSTANT_Unicode: { 1668 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); 1669 DBG(printf("JVM_CONSTANT_Unicode")); 1670 break; 1671 } 1672 case JVM_CONSTANT_Utf8: { 1673 Symbol* sym = symbol_at(idx); 1674 char* str = sym->as_utf8(); 1675 // Warning! It's crashing on x86 with len = sym->utf8_length() 1676 int len = (int) strlen(str); 1677 Bytes::put_Java_u2((address) (bytes+1), (u2) len); 1678 for (int i = 0; i < len; i++) { 1679 bytes[3+i] = (u1) str[i]; 1680 } 1681 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); 1682 break; 1683 } 1684 case JVM_CONSTANT_Integer: { 1685 jint val = int_at(idx); 1686 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1687 break; 1688 } 1689 case JVM_CONSTANT_Float: { 1690 jfloat val = float_at(idx); 1691 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1692 break; 1693 } 1694 case JVM_CONSTANT_Long: { 1695 jlong val = long_at(idx); 1696 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1697 idx++; // Long takes two cpool slots 1698 break; 1699 } 1700 case JVM_CONSTANT_Double: { 1701 jdouble val = double_at(idx); 1702 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1703 idx++; // Double takes two cpool slots 1704 break; 1705 } 1706 case JVM_CONSTANT_Class: 1707 case JVM_CONSTANT_UnresolvedClass: 1708 case JVM_CONSTANT_UnresolvedClassInError: { 1709 *bytes = JVM_CONSTANT_Class; 1710 Symbol* sym = klass_name_at(idx); 1711 idx1 = tbl->symbol_to_value(sym); 1712 assert(idx1 != 0, "Have not found a hashtable entry"); 1713 Bytes::put_Java_u2((address) (bytes+1), idx1); 1714 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); 1715 break; 1716 } 1717 case JVM_CONSTANT_String: { 1718 *bytes = JVM_CONSTANT_String; 1719 Symbol* sym = unresolved_string_at(idx); 1720 idx1 = tbl->symbol_to_value(sym); 1721 assert(idx1 != 0, "Have not found a hashtable entry"); 1722 Bytes::put_Java_u2((address) (bytes+1), idx1); 1723 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); 1724 break; 1725 } 1726 case JVM_CONSTANT_Fieldref: 1727 case JVM_CONSTANT_Methodref: 1728 case JVM_CONSTANT_InterfaceMethodref: { 1729 idx1 = uncached_klass_ref_index_at(idx); 1730 idx2 = uncached_name_and_type_ref_index_at(idx); 1731 Bytes::put_Java_u2((address) (bytes+1), idx1); 1732 Bytes::put_Java_u2((address) (bytes+3), idx2); 1733 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); 1734 break; 1735 } 1736 case JVM_CONSTANT_NameAndType: { 1737 idx1 = name_ref_index_at(idx); 1738 idx2 = signature_ref_index_at(idx); 1739 Bytes::put_Java_u2((address) (bytes+1), idx1); 1740 Bytes::put_Java_u2((address) (bytes+3), idx2); 1741 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); 1742 break; 1743 } 1744 case JVM_CONSTANT_ClassIndex: { 1745 *bytes = JVM_CONSTANT_Class; 1746 idx1 = klass_index_at(idx); 1747 Bytes::put_Java_u2((address) (bytes+1), idx1); 1748 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); 1749 break; 1750 } 1751 case JVM_CONSTANT_StringIndex: { 1752 *bytes = JVM_CONSTANT_String; 1753 idx1 = string_index_at(idx); 1754 Bytes::put_Java_u2((address) (bytes+1), idx1); 1755 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); 1756 break; 1757 } 1758 case JVM_CONSTANT_MethodHandle: 1759 case JVM_CONSTANT_MethodHandleInError: { 1760 *bytes = JVM_CONSTANT_MethodHandle; 1761 int kind = method_handle_ref_kind_at_error_ok(idx); 1762 idx1 = method_handle_index_at_error_ok(idx); 1763 *(bytes+1) = (unsigned char) kind; 1764 Bytes::put_Java_u2((address) (bytes+2), idx1); 1765 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); 1766 break; 1767 } 1768 case JVM_CONSTANT_MethodType: 1769 case JVM_CONSTANT_MethodTypeInError: { 1770 *bytes = JVM_CONSTANT_MethodType; 1771 idx1 = method_type_index_at_error_ok(idx); 1772 Bytes::put_Java_u2((address) (bytes+1), idx1); 1773 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); 1774 break; 1775 } 1776 case JVM_CONSTANT_InvokeDynamic: { 1777 *bytes = tag; 1778 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 1779 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 1780 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); 1781 Bytes::put_Java_u2((address) (bytes+1), idx1); 1782 Bytes::put_Java_u2((address) (bytes+3), idx2); 1783 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); 1784 break; 1785 } 1786 } 1787 DBG(printf("\n")); 1788 bytes += ent_size; 1789 size += ent_size; 1790 } 1791 assert(size == cpool_size, "Size mismatch"); 1792 1793 // Keep temorarily for debugging until it's stable. 1794 DBG(print_cpool_bytes(cnt, start_bytes)); 1795 return (int)(bytes - start_bytes); 1796 } /* end copy_cpool_bytes */ 1797 1798 #undef DBG 1799 1800 1801 void ConstantPool::set_on_stack(const bool value) { 1802 if (value) { 1803 // Only record if it's not already set. 1804 if (!on_stack()) { 1805 _flags |= _on_stack; 1806 MetadataOnStackMark::record(this); 1807 } 1808 } else { 1809 // Clearing is done single-threadedly. 1810 _flags &= ~_on_stack; 1811 } 1812 } 1813 1814 // JSR 292 support for patching constant pool oops after the class is linked and 1815 // the oop array for resolved references are created. 1816 // We can't do this during classfile parsing, which is how the other indexes are 1817 // patched. The other patches are applied early for some error checking 1818 // so only defer the pseudo_strings. 1819 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) { 1820 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused 1821 Handle patch = cp_patches->at(index); 1822 if (patch.not_null()) { 1823 assert (tag_at(index).is_string(), "should only be string left"); 1824 // Patching a string means pre-resolving it. 1825 // The spelling in the constant pool is ignored. 1826 // The constant reference may be any object whatever. 1827 // If it is not a real interned string, the constant is referred 1828 // to as a "pseudo-string", and must be presented to the CP 1829 // explicitly, because it may require scavenging. 1830 int obj_index = cp_to_object_index(index); 1831 pseudo_string_at_put(index, obj_index, patch()); 1832 DEBUG_ONLY(cp_patches->at_put(index, Handle());) 1833 } 1834 } 1835 #ifdef ASSERT 1836 // Ensure that all the patches have been used. 1837 for (int index = 0; index < cp_patches->length(); index++) { 1838 assert(cp_patches->at(index).is_null(), 1839 "Unused constant pool patch at %d in class file %s", 1840 index, 1841 pool_holder()->external_name()); 1842 } 1843 #endif // ASSERT 1844 } 1845 1846 #ifndef PRODUCT 1847 1848 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool 1849 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { 1850 guarantee(obj->is_constantPool(), "object must be constant pool"); 1851 constantPoolHandle cp(THREAD, (ConstantPool*)obj); 1852 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); 1853 1854 for (int i = 0; i< cp->length(); i++) { 1855 if (cp->tag_at(i).is_unresolved_klass()) { 1856 // This will force loading of the class 1857 Klass* klass = cp->klass_at(i, CHECK); 1858 if (klass->is_instance_klass()) { 1859 // Force initialization of class 1860 InstanceKlass::cast(klass)->initialize(CHECK); 1861 } 1862 } 1863 } 1864 } 1865 1866 #endif 1867 1868 1869 // Printing 1870 1871 void ConstantPool::print_on(outputStream* st) const { 1872 assert(is_constantPool(), "must be constantPool"); 1873 st->print_cr("%s", internal_name()); 1874 if (flags() != 0) { 1875 st->print(" - flags: 0x%x", flags()); 1876 if (has_preresolution()) st->print(" has_preresolution"); 1877 if (on_stack()) st->print(" on_stack"); 1878 st->cr(); 1879 } 1880 if (pool_holder() != NULL) { 1881 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder())); 1882 } 1883 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache())); 1884 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references())); 1885 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map())); 1886 1887 for (int index = 1; index < length(); index++) { // Index 0 is unused 1888 ((ConstantPool*)this)->print_entry_on(index, st); 1889 switch (tag_at(index).value()) { 1890 case JVM_CONSTANT_Long : 1891 case JVM_CONSTANT_Double : 1892 index++; // Skip entry following eigth-byte constant 1893 } 1894 1895 } 1896 st->cr(); 1897 } 1898 1899 // Print one constant pool entry 1900 void ConstantPool::print_entry_on(const int index, outputStream* st) { 1901 EXCEPTION_MARK; 1902 st->print(" - %3d : ", index); 1903 tag_at(index).print_on(st); 1904 st->print(" : "); 1905 switch (tag_at(index).value()) { 1906 case JVM_CONSTANT_Class : 1907 { Klass* k = klass_at(index, CATCH); 1908 guarantee(k != NULL, "need klass"); 1909 k->print_value_on(st); 1910 st->print(" {" PTR_FORMAT "}", p2i(k)); 1911 } 1912 break; 1913 case JVM_CONSTANT_Fieldref : 1914 case JVM_CONSTANT_Methodref : 1915 case JVM_CONSTANT_InterfaceMethodref : 1916 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); 1917 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); 1918 break; 1919 case JVM_CONSTANT_String : 1920 if (is_pseudo_string_at(index)) { 1921 oop anObj = pseudo_string_at(index); 1922 anObj->print_value_on(st); 1923 st->print(" {" PTR_FORMAT "}", p2i(anObj)); 1924 } else { 1925 unresolved_string_at(index)->print_value_on(st); 1926 } 1927 break; 1928 case JVM_CONSTANT_Integer : 1929 st->print("%d", int_at(index)); 1930 break; 1931 case JVM_CONSTANT_Float : 1932 st->print("%f", float_at(index)); 1933 break; 1934 case JVM_CONSTANT_Long : 1935 st->print_jlong(long_at(index)); 1936 break; 1937 case JVM_CONSTANT_Double : 1938 st->print("%lf", double_at(index)); 1939 break; 1940 case JVM_CONSTANT_NameAndType : 1941 st->print("name_index=%d", name_ref_index_at(index)); 1942 st->print(" signature_index=%d", signature_ref_index_at(index)); 1943 break; 1944 case JVM_CONSTANT_Utf8 : 1945 symbol_at(index)->print_value_on(st); 1946 break; 1947 case JVM_CONSTANT_UnresolvedClass : // fall-through 1948 case JVM_CONSTANT_UnresolvedClassInError: { 1949 CPSlot entry = slot_at(index); 1950 if (entry.is_resolved()) { 1951 entry.get_klass()->print_value_on(st); 1952 } else { 1953 entry.get_symbol()->print_value_on(st); 1954 } 1955 } 1956 break; 1957 case JVM_CONSTANT_MethodHandle : 1958 case JVM_CONSTANT_MethodHandleInError : 1959 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index)); 1960 st->print(" ref_index=%d", method_handle_index_at_error_ok(index)); 1961 break; 1962 case JVM_CONSTANT_MethodType : 1963 case JVM_CONSTANT_MethodTypeInError : 1964 st->print("signature_index=%d", method_type_index_at_error_ok(index)); 1965 break; 1966 case JVM_CONSTANT_InvokeDynamic : 1967 { 1968 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); 1969 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); 1970 int argc = invoke_dynamic_argument_count_at(index); 1971 if (argc > 0) { 1972 for (int arg_i = 0; arg_i < argc; arg_i++) { 1973 int arg = invoke_dynamic_argument_index_at(index, arg_i); 1974 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 1975 } 1976 st->print("}"); 1977 } 1978 } 1979 break; 1980 default: 1981 ShouldNotReachHere(); 1982 break; 1983 } 1984 st->cr(); 1985 } 1986 1987 void ConstantPool::print_value_on(outputStream* st) const { 1988 assert(is_constantPool(), "must be constantPool"); 1989 st->print("constant pool [%d]", length()); 1990 if (has_preresolution()) st->print("/preresolution"); 1991 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); 1992 print_address_on(st); 1993 st->print(" for "); 1994 pool_holder()->print_value_on(st); 1995 if (pool_holder() != NULL) { 1996 bool extra = (pool_holder()->constants() != this); 1997 if (extra) st->print(" (extra)"); 1998 } 1999 if (cache() != NULL) { 2000 st->print(" cache=" PTR_FORMAT, p2i(cache())); 2001 } 2002 } 2003 2004 #if INCLUDE_SERVICES 2005 // Size Statistics 2006 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { 2007 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); 2008 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); 2009 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); 2010 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); 2011 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); 2012 2013 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + 2014 sz->_cp_refmap_bytes; 2015 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; 2016 } 2017 #endif // INCLUDE_SERVICES 2018 2019 // Verification 2020 2021 void ConstantPool::verify_on(outputStream* st) { 2022 guarantee(is_constantPool(), "object must be constant pool"); 2023 for (int i = 0; i< length(); i++) { 2024 constantTag tag = tag_at(i); 2025 CPSlot entry = slot_at(i); 2026 if (tag.is_klass()) { 2027 if (entry.is_resolved()) { 2028 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2029 } 2030 } else if (tag.is_unresolved_klass()) { 2031 if (entry.is_resolved()) { 2032 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2033 } 2034 } else if (tag.is_symbol()) { 2035 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2036 } else if (tag.is_string()) { 2037 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2038 } 2039 } 2040 if (cache() != NULL) { 2041 // Note: cache() can be NULL before a class is completely setup or 2042 // in temporary constant pools used during constant pool merging 2043 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); 2044 } 2045 if (pool_holder() != NULL) { 2046 // Note: pool_holder() can be NULL in temporary constant pools 2047 // used during constant pool merging 2048 guarantee(pool_holder()->is_klass(), "should be klass"); 2049 } 2050 } 2051 2052 2053 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { 2054 char *str = sym->as_utf8(); 2055 unsigned int hash = compute_hash(str, sym->utf8_length()); 2056 unsigned int index = hash % table_size(); 2057 2058 // check if already in map 2059 // we prefer the first entry since it is more likely to be what was used in 2060 // the class file 2061 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2062 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2063 if (en->hash() == hash && en->symbol() == sym) { 2064 return; // already there 2065 } 2066 } 2067 2068 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); 2069 entry->set_next(bucket(index)); 2070 _buckets[index].set_entry(entry); 2071 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2072 } 2073 2074 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { 2075 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); 2076 char *str = sym->as_utf8(); 2077 int len = sym->utf8_length(); 2078 unsigned int hash = SymbolHashMap::compute_hash(str, len); 2079 unsigned int index = hash % table_size(); 2080 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2081 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2082 if (en->hash() == hash && en->symbol() == sym) { 2083 return en; 2084 } 2085 } 2086 return NULL; 2087 } --- EOF ---